Since getting a MBP I'm not shutting it down. Not sure what magic they are doing (some very deep sleep) but shutting it down't is absolutely not needed... When

Since getting a MBP I'm not shutting it down. Not sure what magic they are doing (some very deep sleep) but shutting it down't is absolutely not needed... When I step away I just close the lid and then open in it 1h or a couple of days and have everything as it was ready to work in split second...